Back tab of a shoe



FIG. 1 is a right side elevational view of a back tab of a shoe showing my new design, the left side being a mirror image;

FIG. 2 is a rear elevational view, the front being plain and unornamented; and

FIG. 3 is a top plan view.

The broken line showing of a shoe in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a back tab of a shoe, as shown and described. 